<!DOCTYPE html>
<html>
    <head>
        <meta charset="UTF-8">
        <title>Html和CSS的关系</title>
        <style type="text/css">
        h1{
            font-size:12px;
            color:#930;
            text-align:center;
        }
        </style>
    </head>
    <body>
        <h1>Hello World!</h1>
    </body>
</html>